46 CFR §154.1335

1. (a)Each cargo tank must have the following:
   1. (1)A pressure gauge that:
      1. (i)Monitors the vapor space;
      2. (ii)Is readable at the tank; and
      3. (iii)Has remote readouts at the cargo control station.
   2. (2)If vacuum protection is required under § 154.804, a vacuum gauge meeting paragraphs (a)(1)(i), (a)(1)(ii), and (a)(1)(iii) of this section.
2. (b)The vessel must have at least one high pressure alarm that:
   1. (1)Actuates before the pressure in any cargo tank exceeds the maximum pressure specially approved by the Commandant (CG-OES); and
   2. (2)Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse.
3. (c)If vacuum protection is required under § 154.804, the vessel must have at least one low pressure alarm that:
   1. (1)Actuates before the pressure in any cargo tank falls below the minimum pressure specially approved by the Commandant (CG-522); and
   2. (2)Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse.
4. (d)At least one pressure gauge must be fitted on each:
   1. (1)Enclosed hold;
   2. (2)Enclosed interbarrier space;
   3. (3)Cargo pump discharge line;
   4. (4)Liquid cargo manifold; and
   5. (5)Vapor cargo manifold.
5. (e)There must be a local manifold pressure gauge between each manifold stop valve and each hose connection to the shore.